Glad to know that the sort of information seemed to have helped. I've seen the actual N900 PCB through FCC webpage along with joerg_rw pages many times and have always wondered that if such test connectors are on literally every N900 being made and thus sold. Those sorts of ports are fairly well known within the wireless LAN tinkerer's community but the ports are not always available.

Like I said, I really don't know if these test ports, paired with right cables, antennas, etc would give one significant gain if its all done right. However I remain on a positive notion of thought that it will as long as those test ports are actually wired properly.

The entries on external antenna connectivity from the wiki was added by me not long ago as well so its definitely something new there as I have been curious for quite sometime over it. I still haven't actually seen my own N900's PCB in bare light but I reckon those test ports would still be there.

As for drilling holes, yeah I know it wasn't the brightest idea but I spotted a clear area from joerg_rw's high resolution photos of N900's internals. The clear area that I'm talking about is near the monitor connector. Even after talking with joerg_rw and got information that drilling holes is stupid, I still want to persist by maybe holding N900's PCB against a strong light (so to ascertain if there's actually any wiring beneath the PCB itself).

Still working with photos of other people's N900, I am rather clueless as to the specific area near the battery connectors. Aren't they on the obverse side? I can't think of any holes near there but maybe having the cables loop around from the front to the back via maybe the edges of the PCB. I guess I'll have to have a closer look at those high resolution photos again, but thanks for pointing that out

If there are holes for at least two of those hirose u.fl to RP-SMA adapters plus maybe some sort of fancy cable that could possibly allow one to connect a small custom PCB containing compass and/or gyroscope (information on these two chips can be found on that hardware hacking wiki page) , have that little PCB either somehow glued onto N900's PCB with four small plastic risers and have it placed in the visibly blank area of N900's PCB (near where the monitor connector is). If gluing the custom made PCB with one or two extra chips onto N900's PCB is a stupid idea, maybe just have the whole PCB `floating' around that monitor connector area and have it supported by the cables wired to somewhere on the back of N900 where there are more connectors for GPIO pins. Here is a photo of the exact location that I'm referring to (thanks FCC for making these things public ):

Again the whole idea of custom PCB with extra chip(s) is very far fetched and is one of the many wild ideas I've been pondering for sometime.

I've also given some thoughts into exactly where I would prefer having RP-SMA connectors sticking out. The area would be above the battery and where there is a little `blimp' on the plastic with what appears to be a pre-cut area but its not a cover of some sort. Here is a photo of the exact location that I'm referring to (thanks again to FCC for making these things public):

Maybe ultimately in the long run with these antenna bulkheads sticking out from the rear of the N900 I reckon we should really redesign N900's back cover based on the depth (in cavity) of mugen's custom back cover for N900's double battery capacity, original N900's lookalike rear (with camera lens cover, and all the appropriate words), a rather large kickstand similar to N800, the thickness and type of plastic (could even go with complete metal instead) that Otterbox used for creating N900's `defender case' (heck, even a custom rubber `skin' based on their designs), and a flip open (maybe even removeable) cover to reveal or conceal those antenna bulkheads (maybe even individual flip open covers with labels for each bulkheads). Again this is a really far fetched idea I have that I dream about. Unfortunately no photos this time for calls on custom back cover for N900, I suck at drawing let alone doing things with CAD so you'll have to use your imagination .

FYI, bluetooth and wireless LAN share the same test port connector. There's no way to easily separate them (to my dismay) and there's no point in doing so as they share the same radio band as each other (2.4GHz ISM band).

What was also discussed at the same time in regards to external antennas via test ports with joerg_rw via IRC was maybe also to have a fancy antenna for FM transmitter module. Obviously due to the nature in complexity of understanding how exactly does minor little things in electronics could be affected when such materials (such as aerials) were used and information being transreceived through the radio `network', fancy ideas may not be able to be made possible. Both joerg_rw and SpeedEvil (I am unsure of his handle on t.m.o. threads, maybe the exact same handle ) agree that fitting fancy antennas for FM transmitter may probably do more harm than good. So ideas of turning a real N900 to look similar to fake N900 but its actually a real N900 and instead of having the fake N900's TV antenna be used solely for TV on real N900, it is to be used as FM transmitter could really confuse people in a devilish sort of way:
Ok I don't exactly like the type of antenna they used there nor do I really like the fact that they placed the antenna in the slot where its used for holding stylus pens in the genuine N900 but something like that with a retractable type antenna and place somewhere else would really confuse people pondering if you own a real N900 or a fake N900 . Again just another one of my wild dreams.

N.B.: The idea of having a custom back cover is something that I've always wanted after reading that 3000mAH battery thread. To have double the `Online as it happens' time on N900 in the very least, have a much better kickstand than the standard Nokia provided `chic' type of kickstand which looks rather fragile anyway :P and something that wouldn't look like mugen's ugly back cover would really be ideal.